Home Health This Mutation Likely Saved a Colon Cancer Patient’s Life Health This Mutation Likely Saved a Colon Cancer Patient’s Life By - March 18, 2024 30 0 FacebookTwitterPinterestWhatsApp His tumor had a specific genetic makeup known as mismatch repair-deficient, present in 5% to 10% of all rectal cancer patients, meaning he might qualify for a cutting-edge immunotherapy.